From 147edb894b62e8c448bf14fe97dae7c1cc57b18e Mon Sep 17 00:00:00 2001
From: nukeykt <alexeytf2@icloud.com>
Date: Sun, 24 Sep 2017 23:34:58 +0900
Subject: [PATCH] Reset YM core only when value is changed

---
 libretro/libretro.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libretro/libretro.c b/libretro/libretro.c
index e203b9e..de1dd55 100644
--- a/libretro/libretro.c
+++ b/libretro/libretro.c
@@ -1096,13 +1096,17 @@ static void check_variables(void)
   var.key = "genesis_plus_gx_ym3438";
   environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
   {
+    orig_value = config.ym3438;
     if (!strcmp(var.value, "nuked opn2"))
       config.ym3438 = 1;
     else
       config.ym3438 = 0;
 
-    sound_init();
-    sound_reset();
+    if (orig_value != config.ym3438)
+    {
+      sound_init();
+      sound_reset();
+    }
   }
   #endif